All,
For the purposes of TLS1.3 specification, it’s clear that there is WG consensus to remove support for DSA the same way many curves from NamedGroup (s6.3.2.2) were removed, i.e., we’re going to remove references, code, etc. If there is interest documenting how to support DSA in TLS1.3, a separate draft will need to be produced and it’ll need to work it’s way through the WG process.
spt